Crowdsav is a crowdsourcing platform which complements your CPR training session, and at the same time provides a way for others who have not been trained to experience the action of Hands-only CPR. Our app learns the movements of your hands during Hands-only CPR training, and replicates it later on at your convenience. The app also allows you to refresh your own CPR training using everyday items at home or at work instead of the manikin, eg pillow, sofa, mattress etc.